Yes, it is in eprom, but I think I have tools disk for another version of the drive. Any disktool isn't working. The tool "FORMAT" includes code JSR $89DB, but it jams the program. I read and check out the EPROM several times. Correct jump to ROM for function "FORMAT" is JSR $89D9. I have to check and fix the tool "FILECOPY", then I hope I can reveal the secret of SAVE... LHS Spiro Trikaliotis wrote: > Hello Tomas, > > * On Sun, Apr 15, 2018 at 09:14:23PM +0200 Tomas Vondracek wrote: > >> But there is a little progress. Disassembling revelead different offsets in >> tools and ROM. >> E.g. tools calls: >> JSR $89DB >> >> but correct (and working) according to ROM is: >> JSR $89D9 > > Is the SW stored in an EPROM? $89DB and $89D9 differ in one bit only. If > the "0" is not read correctly anymore, it can show up as a "1", that's > typical for EPROMs. > > Oh, and it also typical for EPROMs if they are used with less voltage > than they should have. > > Regards, > Spiro. >Received on 2018-04-15 22:03:51
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